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We investigate the kinetic-energy spectrum of electrons emitted from anexcited many-electron system, often called photo-electron spectrum (PES). Weare particularly interested on the impact of resonant modes of the system onPES. To this end, we consider three systems with strong resonances, a Mg atom,the small alkaline cluster ${{\rm K}_9}^+$, and the small carbon chain C$_3$.To avoid dominant frequencies in the excitation process, we consider acollision with a fast ion which is realized by an instantaneous boost of thevalence electrons, a process which excites all frequencies with equal weight.The electron dynamics is investigated from a theoretical perspective usingtime-dependent density-functional theory augmented by an average-densityself-interaction correction. We observe patterns which are similar to PESusually obtained after irradiation by a laser pulse, in particular theappearance of clear peaks. We show that these patterns are driven by strongresonance modes of the system. Resonances are thus found to be another sourceof peaks in the PES, besides photons (when present) with definite frequencies.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Multi-plasmon excitations in electron spectra of small systems irradiated by swift charged projectiles